fix pageUp and pageDown boot command usb key strokes (#46)

Author: sylviamoss

bootcommand/usb_driver.go

@@ -55,8 +55,8 @@ func NewUSBDriver(send SendUsbScanCodes, interval time.Duration) *usbDriver {
 		"insert":     key.CodeInsert,
 		"home":       key.CodeHome,
 		"end":        key.CodeEnd,
-		"pageUp":     key.CodePageUp,
-		"pageDown":   key.CodePageDown,
+		"pageup":     key.CodePageUp,
+		"pagedown":   key.CodePageDown,
 		"left":       key.CodeLeftArrow,
 		"right":      key.CodeRightArrow,
 		"up":         key.CodeUpArrow,

bootcommand/usb_driver_test.go

@@ -19,6 +19,16 @@ func TestUSBDriver(t *testing.T) {
 			key.CodeLeftShift,
 			false,
 		},
+		{
+			"<pageUp>",
+			key.CodePageUp,
+			false,
+		},
+		{
+			"<pageDown>",
+			key.CodePageDown,
+			false,
+		},
 		{
 			"<leftShiftOff>",
 			key.CodeLeftShift,